MusicKit errors on iPadOS 16.1 beta

Creating playlists on iPadOS 16.1 isn't working for me. The code:

let playlist = try await MusicLibrary.shared.createPlaylist(name: caption, description: description, authorDisplayName: curator, items: items)

is throwing the error "Attempting to retrieve handler for an unsupported configuration". The full error is:

The same code is working fine on an iPhone running iOS 16.0.

Does anyone know how to get this working?